On Android, there is a way to set how private numbers are handled when they are calling you.
To navigate to the setting, tap on the 3 bars located at the top left of your screen.
Once you select the menu icon, you will see Call Protection.
From that screen, you will see a gear icon located on the top right, tap on that and select Protection Settings
Once you select smart blocking, you're going to look for Private Numbers
In private number handling you'll have the option to allow, block, request unblock and for the caller to input their number. From here all your private calls will be handled the same way.